I too have a mouse pointer Flicker problem, currently using the latest Trial Version together with MacOS Mojave. When I perform a action in "Windows 10" I get a mouse flicker at times, It seems to transition from the "Windows" mouse pointer to the MacOS mouse pointer, and then back again to the "Windows" mouse pointer. This happens rapidly and is almost no visible. It appears as a flicker. I have found a workaround, by disabling all Integration with the MacOS, especially creating "ICONS" in the MacOS "Dock", it seems as if the "Dock" in mackOS gets Focus and then reverts back to the Guest OS. This fixed it for me, and because of this I am yet to decide, Parallels or the other one. I can't decide yet.